Is “Kill the boy” (with or without foresight) this worst advice Jon ever received? Are we all overestimating Aemon’s wisdom, after all the same advise led Egg to Summerhall, right?

I hate to speak ill of the dead, especially Maester Aemon, but either “kill the boy” is one of the most misunderstood pieces of advice in the series or it’s one of the worst. 

Because if you look at how the advice shapes Jon’s actions in ADWD, it mostly leads him to push away his friends, ultimately weakening the support structure around him until there’s no one to protect him when the knives come out.